Masters Degrees (Electrical and Electronic Engineering)

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Recent Submissions

A low cost, high precision star sensor

Jacobs, M. J. (Stellenbosch : University of Stellenbosch, 1995-12)

ENGLISH ABSTRACT: The Sunsat microsatellite is being developed at the University of Stellenbosch. It is equipped with a high resolution earth imager which requires a sophisticated attitude determination and control system. ...
Electromagnetic modelling of a borehole radar environment with the finite difference time domain method

Burger, Ernst H. (Stellenbosch : University of Stellenbosch, 2000-12)

South Africa has an immensely rich reserve of minerals which still has to be exploited. The problem with these reserves is that they exist in reefs where the mining environment is extremely hazardous, and where mining ...
Advanced modelling of a borehole radar environment with the finite difference time domain method

Futter, Peter W. (Stellenbosch : University of Stellenbosch, 2001-12)

Over the last decade, as the mining industry of South Africa is moving to ever deeper mines, the borehole radar is becoming an increasingly important field of research. In December 2000, Burger completed his thesis on ...
An active receiving antenna for borehole pulsed radar applications

Van Wyk, M. D. (Stellenbosch : University of Stellenbosch, 2002-12)

An efficient radiating strucllire was needed for borehole pulsed radar applications in the 10-100 MHz frequency band. Both resistively loaded and insulated wire antennas were investigated and an active antenna is proposed ...
Development of an active pulsed radar receiver for a mono-static borehole-radar tool

Woods, Brian Keith (Stellenbosch : University of Stellenbosch, 2003-03)

No abstract available
Generalised density function estimation using moments and the characteristic function

Esterhuizen, Gerhard (Stellenbosch : University of Stellenbosch, 2003-03)

ENGLISH ABSTRACT: Probability density functions (PDFs) and cumulative distribution functions (CDFs) play a central role in statistical pattern recognition and verification systems. They allow observations that do not ...
The design of a monostatic, ultra wide band,VHF, pulse radar for detection of close-in targets

Van der Merwe, P. J. (Stellenbosch : University of Stellenbosch, 2003-03)

Ground penetrating radar is currently proving itself as an invaluable tool for the prediction of geological structures in the mining environment. Borehole radar is a specific application of this technology, useful in the ...
The development of a one-dimensional quasi-steady state model for the desulphurisation process at Saldanha Steel

Scheepers, Emile (Stellenbosch : University of Stellenbosch, 2003-04)

ENGLISH ABSTRACT: The pneumatic injection of reagent powder into molten iron has become the preferred way to carry out iron and steel desulphurisation. It is therefore essential to not only understand the thermodynamic ...
Design and implementation of a DSP based controller for power electronic applications

Van Heerden, Gerhard Johann (Stellenbosch : University of Stellenbosch, 2003-04)

ENGLISH ABSTRACT: In the field of power electronic engineering, there is a need for a reconfigurable power electronic controller. Such a controller will enable engineers to stay focussed on their main field of study, not ...
A spaceborne GPS receiver

Nortier, Benjamin J. (Stellenbosch : University of Stellenbosch, 2003-12)

ENGLISH ABSTRACT: The purpose of this study was to develop a Global Positioning System (GPS) receiver for use on a Low-Earth Orbit (LEO) satellite. The study includes an examination of some of the fundamental GPS theory ...
Mixed-potential integral equation technique for hybrid microstrip-slotline mutli-layered circuits with horizontal and vertical shielding walls

Schoeman, Marlize (Stellenbosch : University of Stellenbosch, 2003-12)

ENGLISH ABSTRACT: A complete mixed-potential integral equation formulation for the analysis of arbitrarily shaped scatterers in a planarly layered medium is presented. The integral equation is able to solve for simultaneous ...
The design of a hard rock permittivity and loss sensor to be integrated with borehole radar

Kotze, Beukes (Stellenbosch : University of Stellenbosch, 2004-03)

The use of ground penetrating radar, and especially borehole radar in underground mines, is becoming increasingly attractive. This is due to the improvements in the user friendliness of this system. Borehole radar is ...
The instrumentation and initial analysis of the short-term control and stability derivatives of an ASK-I3 glider

Browne, Keith R.J. (Stellenbosch : University of Stellenbosch, 2004-03)

ENGLISH ABSTRACT: This thesis describes the process followed to determine the short-term control and stability derivatives of an ASK-13 glider (ZS-GHB). The short-term control and stability derivatives are obtained by ...
Data capturing system using cellular phone, verified against propagation models

Visser, Schalk W. J. (Schalk Willem Jacobus) (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: Data capturing equipment are an expensive part of testing the coverage of a deployed or planned wireless service. This thesis presents the development of such a data capturing system that make use of ...
A broadband microwave limiting amplifier

Neethling, M. (Marthinus) (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: Limiting amplifiers are employed in electronic warfare (EW) systems requiring a high measure of amplitude control. These EW systems employ sensitive signal processing components that are unable to accept ...
Speech generation in a spoken dialogue system

Visagie, Albertus Sybrand (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: Spoken dialogue systems accessed over the telephone network are rapidly becoming more popular as a means to reduce call-centre costs and improve customer experience. It is now technologically feasible ...
Transformerless series dip/sag compensation with ultracapacitors

Becker, Martin Gerhard (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: This thesis covers the development of a transformerless series dip compensator. Of all known power quality problems, voltage dips are the greatest reason for concern. Series injection dip compensators offer ...
Bidirectional converter for a stirling energy system

Redecker, H. H. (Hans Henning) (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: This thesis discusses a 23 kW three-phase AC bus system that is utilized together with the “Stirling Energy System (SES) Integrated Solar Dish-Stirling Module” to function as a mini-grid for off-grid ...
The safety and comfort of a patient during robot-based positioning for accurate radiotherapy

Von Hoesslin, Neil (Stellenbosch : University of Stellenbosch, 2004-12)

Please refer to full text for abstract.
Pulse power device characterization for amplifier design

Fourie, Paul (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: Bi-polar Si transistors optimized for pulse conditions is still the most popular choice as amplification element in the final stages of solid-state radar amplifiers in L and S band. With the radar market ...
A three-phase AC/AC matrix converter system

Gebrehiwet Gebregergis, Abraham (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: The thesis discusses the analysis and design of a three-phase-to-three-phase direct AC-AC matrix converter. A background study of the various matrix converter topologies and their modulation strategies ...
Independent formant and pitch control applied to singing voice

Calitz, Wietsche Roets (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: A singing voice can be manipulated artificially by means of a digital computer for the purposes of creating new melodies or to correct existing ones. When the fundamental frequency of an audio signal ...
Non-acoustic speaker recognition

Du Toit, Ilze (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: In this study the phoneme labels derived from a phoneme recogniser are used for phonetic speaker recognition. The time-dependencies among phonemes are modelled by using hidden Markov models (HMMs) for ...
Wavelet-based speech enhancement : a statistical approach

Harmse, Wynand (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: Speech enhancement is the process of removing background noise from speech signals. The equivalent process for images is known as image denoising. While the Fourier transform is widely used for speech ...
Optimisation methods applied to compensator placement

Burger, I. (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: The optimal placement of different types of compensators on electrical networks is a complex task faced by network planners and operations engineers. The successful placement of these devices normally ...
Modular approach to the development of a two-way radio receiver system

Kellerman, Valpre Cecilia (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: The preliminary development of a FM radio receiver module is discussed. An existing narrowband system operating between 48MHz and 50MHz will be replaced. Digital components were investigated, compared ...
Electricity theft detection on a low voltage reticulation environment

Doorduin, Riaan (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: Electricity theft in South Africa has become a major problem. This led to several developments from both industries and research institutes to counter these actions. Since equipment is already installed ...
Control of a 1.5 MW active power filter and regeneration converter for a Spoornet DC traction substation

Henning, Pieter Hendrik (Stellenbosch : University of Stellenbosch, 2005-03)

Although regenerative braking has been in used in railway systems for a long time already, the energy generated was dissipated in resistor banks. The rapid advances in the power electronics field, accompanied by the ...
Active capacitor voltage stabilisation in a medium-voltage flying-capacitor multilevel active filter

Hansmann, Chirstine Henriette (Stellenbosch : University of Stellenbosch, 2005-03)

A switching state substitution must be developed that will make use of both single-phase redundancies and three-phase redundancies in the flying-capacitor topology. Losses should be taken into consideration and the ...
Facial Feature Reconstruction using Structure from Motion

Rautenbach, Pieter Albertus (Stellenbosch : University of Stellenbosch, 2005-03)

Structure from Motion suggests that an object or scene’s three-dimensional structure can be determined from its observed two-dimensional motion. Human efforts, manifested in computer algorithms, try to mimic the ...